What Andrew__USA described matches my experience of dating app for muslims almost exactly.
My rule for dating app for muslims now is simple: check whether the sorting can be trusted on day one.
About 100 profiles into the service, the pattern around whether the filters survive a refresh became obvious.
If you can only manage a few evenings a week, whether the search actually respects what you set matters more than raw volume on that one.
The reason I stopped recommending some of these is whether the sorting can be trusted.
Ended up splitting my time between this and Datescout - worth a look.